Step 6: Mark the location for the center guide slot.
Use a tape measure to locate the center of the box. Now, use a combination square to draw a 90-degree line across the center mark on both sides of the box. Use the combination square to continue the line down the inside and then the outside of both sides of the box. Take time to make sure the line is square and straight.
 Use a combination square to mark a perfect 90-degree line.
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